Users Guide

• Automatic configuration of switch ports after detection of storage arrays.
• If you configure flow-control, iSCSI uses the current configuration. If you do not configure flow-control,
iSCSI auto-configures flow control settings so that receive-only is enabled and transmit-only is
disabled. .
• iSCSI monitoring sessions — the switch monitors and tracks active iSCSI sessions in connections on the
switch, including port information and iSCSI session information.
• iSCSI QoS — A user-configured iSCSI class of service (CoS) profile is applied to all iSCSI traffic. Classifier
rules are used to direct the iSCSI data traffic to queues that can be given preferential QoS treatment over
other data passing through the switch. Preferential treatment helps to avoid session interruptions during
times of congestion that would otherwise cause dropped iSCSI packets.
The following illustration shows iSCSI optimization between servers and a storage array in which a stack of
three switches connect installed servers (iSCSI initiators) to a storage array (iSCSI targets) in a SAN network.
iSCSI optimization running on the master switch is configured to use dot1p priority-queue assignments to
ensure that iSCSI traffic in these sessions receives priority treatment when forwarded on stacked switch
hardware.
Figure 51. iSCSI Optimization Example
iSCSI Optimization 464